Most professional YouTubers survive primarily off of Patreon support and sponsored videos. YouTube ads provide only a small fraction of what they earn. If they could increase their Patreon or sponsorship income by cross-posting to PeerTube, then they could be enticed to do so. The current issue there is that sponsors are going to want accurate analytics, and PeerTube isn't going to be able to offer the kind of depth of audience analysis that YouTube can.

The problem is, the cost of hosting videos -- both in terms of storage and in terms of bandwidth -- is kind of prohibitive. That part needs to be solved.